Safety door-lock for elevators.



H. L. GOODWIN & .I. G. LUND.

SAFETY DOOR LOCK FOR ELEVATORS.

APPLICATION FILEDJULYH, 1913.

1,146, 1 53, E Patented July 13, 1915.

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SAFETY DOOR LOCK FOR ELEVATORS.

APPLICATION FILED JULY 14 I913.

Patented July 13, 1915.

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Application filed July 14, 1913. Serial N 0. 778,879.

To all whom it may concern Be it known that we, HENRY L. Gooowm and JOHNG. LUND, citizens of the United States, residing at Minneapolis, in thecounty of Hennepin and State of Minnesota, have invented certain new anduseful Improvements in Safety Door-Locks for Elevators; and we do.hereby declare the following to be a full, clear, and exact descriptionofthe invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

Our invention has for its object to provide a highly eflicient andsimple safety device for elevator doors, and to this end it consists ofthe novel devices and combinations of devices hereinafter described anddefined in the claims.

In the accompanying drawings, which illustrate the invention, likecharacters indicate like parts, throughout the several views.

Referring to. the drawings, Figure 1 is a perspective view showing ourinvention applied, in working position, to an elevator, some parts beingbroken away. Fig. 2 is a front elevation of the parts shown in Fig. 1,but on a somewhat smaller scale, and with the elevator carin differentposition. Fig. 3 is a view, principally in vertical section, taken onthe line a 00 of Fig. 1, on an enlarged scale; and Fig. 4 is a detailview, principally in section, taken on the line m r of Fig. 3, on anenlarged scale.

The numeral 1 indicates one of the floors ofa building, through which isextended an elevator shaft 2. A door opening 3 is formed in the casing 1of the elevator shaft between posts 5 and 6. An elevator car 7 is raisedand lowered in the elevator shaft 2 by cables 8, and is held forstraight line movement by upright guides 9. In one side of the elevatorcar 7 is formed a door opening 10, arranged to be brought intoregistration with the door opening 3 in the elevator shaft. A slidingdoor 11 is provided for closing the door opening 3, and is mounted inthe customary manner. The parts thus far described may be of thestandard or any suitable construction.

Referring now in detail to our invention, the numeral 12 indicates alock casing havinga pair of reversely projecting ears13, secured byrivets to the rear vertical member of the marginal frame of the door 11.

A look lever 14. is mounted withinthe. casing: 12, and is. intermediately pivoted thereto by a horizontally extended pin 15,, anchored atitsends to the sides of said casing, The. long or upper end of the locklever. 14 is provided with a lock head 16, and the short or lower endthereof is provided; with a roller equipped lateral extension 17. Thelock head 16. and the roller equipped end of the lever extension 17 workthrough apertures 18. and 19, respectively, formed in the op. positeedges of the lock casing 12. The lever extension 17 is seated in atransverse chan: nel 19, formed in the lock lever 14:, and is se-. curedtherein, for endwise adjustment, by a nut equipped bolt 20, seated in aperforation formed in the lock lever 14:, and a longitudinally extendedslot 21, formed in the. inner end portion of the lever extension 17. Byadjustably securing the lever extension 17 to the lock lever- 14, theroller of said extension may be set in different positions, to. move thelock head 16 different distances, as desired. It, also, permits the locklever to be adjusted to, different elevators wherein the widths betweenthe door posts and the elevator vary. A'leaf spring 22is secured to thelock casing- 12, and yieldingly holds the upper end portion of the locklever. 11 pressed against the lock casing 12, which acts as a stop, withits lock-head 16 projecting through the aperture 19, as best-shown bydotted lines in Fig. 3.

Formed in the inner vertical face of the door post 6 is a detent 23,with which the lock head 16 has interlocking engagement when the door 11is in a closed position. A pair of vertically spaced'andreverselyheveled cam blocks 24: are secured to the elevator car 7,adjacent to its door opening 10, 9.

and are so arranged as to automatically retract the loekhead 16 from thedetent 23 when the elevator car 7 has reached a predetermined position,andthereby permit the door 11 to be opened. These cam blocks 24 12 areso arranged as to only permit the door 11 to open when the door openings3 and'10 are in registration one'to the'other, and the floor of theelevator carfi7 is in the same plane with the floor of the'building.- Ii Journaled in the innerends of the cam blocks 21 is a verticallyextended cam roller 25, over which the rollerofthe lever extension 17travels axially, as the said'roller passes from one cam block 2 1 to theother, 1

and which also serves to hold the lock head a 16 in a retractedposition. When the eleva= tor car 7 is stopped at one of the floors, theroller of the lever extension 17 rests on the cam roller 25 and the door11 is unlocked and free to be moved into an open position. When theelevator car 7 does not stop at one of the floors, the roller of thelever extension 17 passes over the cam blo cks 2 1 and the cam roller25, thereby withdrawing the lock head 16 from detent 23 and unlockingthe door 11 for an instant. As soon as said roller has passed over thecams, the spring 22 is permitted to again force the lock head 16 intoengagement with the detent 23. During the opening movement of the door11, the roller of the lever extension 17 is moved radially out ofengagement with the cam roller 25, but not until after the lock head 16is moved laterally pass the detent 23. At the extreme closing movementof the door 11, the roller of the lever extension engages the roller 25,and is cammed thereby into a position to retract the lock head 16, thuspermitting the same to pass the door post 6 into a position where thesame would again enter the detent 23, when the elevator is moved asufficient distance to carry the roller of the lever extension 17 out ofengagement with the cam acting abutment.

For automatically closing the door 11, in either direction of travel ofthe elevator car 7, a zigzag cam bar 26 is secured to the front of theelevator car 7, and a roller 27, for cooperation therewith, is journaledin a bearing 28 secured to the frame of the door 11 just beneath thelock casing 12. The intermediate portion of the cam bar 26 is located asufficient distance from the roller 27 to permit the door 11 to beopened the full width of the doors openings3 and 10. The end portions ofthe cam bar 26 are so arranged as to engage the roller 27, in eitherdirection of travel of the elevator car 7, and thereby cam the door 11into a closed position where the same will be automatically locked bythe head 16 and cooperatingdetent 28. The extreme end portions of thecam bar 26 are curved laterally to permit the roller 27 to pass thesame, during the travel of the car 7, without striking the same.

As is well lmown, a great many accidents have occurred by personsfalling into elevator shafts when the doors have been accidentally leftopen, and by tripping and falling, in case the elevator is carelesslystopped with its floor either above or below the floor of the building.By the use of our improved device, elevator doors are positively heldlocked, and cannot be opened, except when the elevator car is in apre-determined position. Our invention, also, provides means forpositively closing the elevator door, in case the same is accidentallyleft open by the operator.

What we claim is 1. The combination with an elevator shaft, having adoor opening, a sliding door, normally closing said door opening, and anelevator car arranged to be raised and lowered in said elevator shaft,of a yieldingly closed lock carried by said door, for securing the samein a closed position, and a fixed abutment, carried by said elevatorcar, for engagement with said lock, for automatically retracting thesame, when said elevator car has reached a predetermined position ineither direction of travel, said abutment also arranged to be engaged bysaid lock, during'the closing movement of said door, for retracting saidlock.

2. The combination with an elevator shaft, having a door opening adetent in the elevator shaft casing, a sliding door normally closingsaid door opening, and an elevator car arranged to be raised and loweredin said elevator shaft, of a spring held locklever, carried by said doorand normally having interlocking engagement with said detent, and afixed abutment, carried by said elevator car for retracting said locklever, when said elevator car has reached a predetermined position ineither direction of travel, said abutment also arranged to be engaged bysaid lock-lever, during the closing movement of said door, forretracting said lock lever.

8. The combination with an elevator shaft having a door opening, asliding door normally closing said door opening, and an elevator cararranged to be raised and lowered in said elevator shaft, of a springheld lock lever carried by said door, and having interlocking engagementwith a detent in the elevator shaft casing when said door is closed, andan abutment carried by said elevator car, and comprising a pair ofreversely beveled cam blocks and a cam roller journaled between said camblocks, said cam blocks arranged to retract said lock lever when saidelevator car has reached a predetermined position in either direction oftravel, and said cam roller arranged to retract said lock lever by thefinal closing movement of said door.

4. The combination with an elevator shaft having a door opening, asliding door normally closing said door opening, and an elevator cararranged to be raised and lowered in said elevator shaft, of a springheld lock lever intermediately pivoted to said door, said lever havingat one end a lock head, and having at its other end an adjustableextension, said lock head having interlocking engagement with a detentin the elevator shaft casing when said door is closed, and an abutmentcarried by said elevator car, and comprising a pair of reversely beveledcam blocks, and a cam roller journaled between said cam blocks, saidcam-blocks arranged to engage said lever extension, and In testimonywhereof we aflix our signato retract said cam head from said detent,tures 1n presence of two wltnesses.

when said car has reached a pre-determined position in either directionof travel, and E DWIN' said cam roller arranged to be engaged by saidlever extension during the closing Witnesses:

movement of said door, thereby retracting EMILY M. KING,

said lock head. HARRY D. KILGORE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

